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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2017 $ 192,951 $ 1,370 $ 216,006 $ 291 $ (24,716)
Balance, shares at Dec. 31, 2017   136,996,000      
Common stock issued (Note 3) 137,250 $ 153 137,097    
Common stock issued, shares   15,250,000      
Restricted stock issued and vesting of restricted stock units, net   $ 7 (7)    
Restricted stock issued and vesting of restricted stock units net, shares   789,000      
Shares repurchased (1,430) $ (1) (1,429)    
Shares repurchased, shares   (135,000)      
Exercise of stock options, net 157 $ 2 155    
Exercise of stock options net, shares   183,000      
Stock-based compensation 10,078   10,078    
Other comprehensive income (loss) 82     82  
Dividends (14,202)       (14,202)
Net income 48,197       48,197
Balance at Sep. 30, 2018 373,083 $ 1,531 361,900 373 9,279
Balance, shares at Sep. 30, 2018   153,083,000      
Balance at Jun. 30, 2018 353,323 $ 1,531 359,066 461 (7,735)
Balance, shares at Jun. 30, 2018   153,142,000      
Restricted stock issued and vesting of restricted stock units net, shares   (36,000)      
Shares repurchased (424) $ (1) (423)    
Shares repurchased, shares   (48,000)      
Exercise of stock options, net 18 $ 1 17    
Exercise of stock options net, shares   25,000      
Stock-based compensation 3,240   3,240    
Other comprehensive income (loss) (88)     (88)  
Dividends (5,035)       (5,035)
Net income 22,049       22,049
Balance at Sep. 30, 2018 373,083 $ 1,531 361,900 373 9,279
Balance, shares at Sep. 30, 2018   153,083,000      
Balance at Dec. 31, 2018 $ 358,335 $ 1,532 363,655 467 (7,319)
Balance, shares at Dec. 31, 2018 153,202,000 153,202,000      
Restricted stock issued and vesting of restricted stock units, net   $ 18 (18)    
Restricted stock issued and vesting of restricted stock units net, shares   1,910,000      
Shares repurchased $ (2,187) $ (2) (2,185)    
Shares repurchased, shares   (338,000)      
Exercise of stock options, net 70   70    
Exercise of stock options net, shares   45,000      
Stock-based compensation 8,581   8,581    
Other comprehensive income (loss) (432)     (432)  
Dividends (15,286)       (15,286)
Net income 15,455       15,455
Balance at Sep. 30, 2019 $ 364,536 $ 1,548 370,103 35 (7,150)
Balance, shares at Sep. 30, 2019 154,819,000 154,819,000      
Balance at Jun. 30, 2019 $ 363,819 $ 1,551 367,750 725 (6,207)
Balance, shares at Jun. 30, 2019   155,108,000      
Restricted stock issued and vesting of restricted stock units, net   $ (3) 3    
Restricted stock issued and vesting of restricted stock units net, shares   (301,000)      
Shares repurchased (80)   (80)    
Shares repurchased, shares   (13,000)      
Exercise of stock options, net 56   56    
Exercise of stock options net, shares   25,000      
Stock-based compensation 2,374   2,374    
Other comprehensive income (loss) (690)     (690)  
Dividends (5,095)       (5,095)
Net income 4,152       4,152
Balance at Sep. 30, 2019 $ 364,536 $ 1,548 $ 370,103 $ 35 $ (7,150)
Balance, shares at Sep. 30, 2019 154,819,000 154,819,000